标签:des style blog http color 使用
在WWDC的演示中就可以看出来Swift这个更接近于脚本的语言可以用更少的代码量完成和OC同样的功能。但是对于像我一样在战争中学习战争的同学们来说,天天抱着笨Swift Programming Language Reference之类的大部头看不实际。毕竟还是要养家糊口的。而且,那么1000+页内容讲的东西不是什么都要全部在平时工作中用到的。咱们就把平时用到的全部都放在一起,忘记了立马翻开看看,不知不觉的就学会了之后变成习惯。这样多省事。
变量
1 // Variable 2 var int_variable = 1 // 类型推断 3 var message : String 4 var x = 0.0, y = 0.0, z = 0.0
常量
// Constant let const_int = 1 //const_int = 10 ERROR: can not assign to let value
字符串
// String // 1. 定义 var empty_string = "" var another_empty_string = String() // 2. 拼接 var hello_string = "hello" var world_string = " world" hello_string += world_string // hello world let multiplier = 3 //let multiplier_message = "\(mulitplier) times 2.5 is \(Double(multiplier) * 2.5)" // 3. 比较 var hello_world_string = "hello world" hello_string == hello_world_string // all are "hello world", result is true if hello_string == hello_world_string { println("These two are equal") }
Tuple
// Tuple // 1. Unnamed tuple let http_not_found = (404, "Not Found") println("tuple item 1 \(http_not_found.0), tuple item 2 \(http_not_found.1)") // 2. Named tuple let (statusCode, statusMessage) = (404, "Not Found") statusCode // 404 statusMessage // "Not Found" let http_not_found2 = (statusCode:404, statusMessage:"Not Found") http_not_found2.statusCode // 404 http_not_found2.statusMessage // "Not Found" // 3. return tuple func getHttpStatus() -> (statusCode : Int, statusMessage : String){ // request http return (404, "Not Found") }
数组
// Array // 1. 定义 //var empty_array = [] // 在swift里没事不要这样定义数组。这是NSArray类型的,一般是Array<T>类型的 var empty_array : [Int] var empty_array2 = [Int]() var fire_works = [String]() var colors = ["red", "yellow"] var fires : [String] = ["small fire", "big fire"]; // Xcode6 beta3里数组的类型是放在方括号里的 var red = colors[0] // 2. append & insert colors.append("black") colors += "blue" colors += fires colors.insert("no color", atIndex: 0) // 3. update colors[2] = "light blue" //colors[5...9] = ["pink", "orange", "gray", "limon"] // 4. remove colors.removeAtIndex(5) //colors[0] = nil ERROR! // other colors.isEmpty colors.count
字典
// Dictionary // 1. 定义 var airports : Dictionary<String, String> = ["TYP":"Tokyo", "DUB":"Boublin"] var airports2 = ["TYP":"Tokyo", "DUB":"Boublin"] var empty_dic = Dictionary<String, String>() var empty_dic2 = [:] // 2. update airports.updateValue("Dublin International", forKey: "DUB") airports["DUB"] = "Dublin International" // 3. insert airports["CHN"] = "China International" // 4. check exists if let airportName = airports["DUB"] { println("The name of the airport is \(airportName).") } else{ println("That airport is not in the airports dictionary.") } // 5. iterate for (airportCode, airportName) in airports{ println("\(airportCode):\(airportName)") } // 6. remove airports.removeValueForKey("TYP") airports["DUB"] = nil
枚举
// Enum // 1. defination & usage enum PowerStatus: Int{ case On = 1 case Off = 2 } enum PowerStatus2: Int{ case On = 1, Off, Unknown } var status = PowerStatus.On enum Barcode { case UPCA(Int, Int, Int) case QRCode(String) } var product_barcode = Barcode.UPCA(8, 8679_5449, 9) product_barcode = .QRCode("ABCDEFGHIJKLMN") switch product_barcode{ case .UPCA(let numberSystem, let identifier, let check): println("UPC-A with value of \(numberSystem), \(identifier), \(check)") case .QRCode(let productCode): println("QR code with value of \(productCode)") }
方法
// Function // 1. 定义 func yourFuncName(){ } // 2. 返回值 func yourFuncNameWithReturnType()->String{ return "" } // 3. 参数 func funcWithParameter(parameter1:String, parameter2:String)->String{ return parameter1 + parameter2 } funcWithParameter("1", "2") // 4. 外部参数名 func funcWithExternalParameter(externalParameter p1:String) -> String{ return p1 + " " + p1 } funcWithExternalParameter(externalParameter: "hello world") func joinString(string s1: String, toString s2: String, withJoiner joiner: String) -> String { return s1 + joiner + s2 } joinString(string: "hello", toString: "world", withJoiner: "&") // 外部内部参数同名 func containsCharacter(#string: String, #characterToFind: Character) -> Bool { for character in string { if character == characterToFind { return true } } return false } containsCharacter(string: "aardvark", characterToFind: "v") // 默认参数值 func joinStringWithDefaultValue(string s1: String, toString s2: String, withJoiner joiner: String = " ") -> String { return s1 + joiner + s2 } joinStringWithDefaultValue(string: "hello", toString: "world") //joiner的值默认为“ ” // inout参数 func swapTwoInts(inout a: Int, inout b: Int) { let temporaryA = a a = b b = temporaryA } var someInt = 3 var anotherInt = 107 swapTwoInts(&someInt, &anotherInt) println("someInt is now \(someInt), and anotherInt is now \(anotherInt)") // prints "someInt is now 107, and anotherInt is now 3
类
// Class // 1. 定义 class NamedShape { var numberOfSides: Int = 0 var name: String init(name: String) { self.name = name } func simpleDescription() -> String { return "A shape with \(numberOfSides) sides." } } // 2. 继承 & 函数重载 & 属性getter setter class Square: NamedShape { var sideLength: Double init(sideLength: Double, name: String) { self.sideLength = sideLength super.init(name: name) numberOfSides = 4 } func area() -> Double { return sideLength * sideLength } // 函数重载 override func simpleDescription() -> String { return "A square with sides of length \(sideLength)." } } class EquilateralTriangle: NamedShape { var sideLength: Double = 0.0 init(sideLength: Double, name: String) { self.sideLength = sideLength super.init(name: name) numberOfSides = 3 } // 属性的getter setter var perimeter: Double { get { return 3.0 * sideLength } set { sideLength = newValue / 3.0 } } override func simpleDescription() -> String { return "An equilateral triagle with sides of length \(sideLength)." } } // 3. 使用 var triangle = EquilateralTriangle(sideLength: 3.1, name: "a triangle") triangle.perimeter triangle.perimeter = 9.9 triangle.sideLength
其他稍后补充
标签:des style blog http color 使用
原文地址:http://www.cnblogs.com/sunshine-anycall/p/3851717.html